Changes in temperature field of Air and Liquid Multi-flow Dyeing Machine

Compared with the airflow dyeing machine, although the fabric in the Air and Liquid Multi-flow Dyeing Machine also relies on airflow, the airflow does not carry the dye solution, so the amount of dye solution exchanged with the dyed fabric in a single cycle is not limited. The amount of liquid in a single cycle of the fabric can be determined according to the needs of the dyeing process. For the temperature field of sensitive colors, the amount of liquid on the dyed fabric can be increased to shorten the temperature balance time of each point in the heat transfer system to obtain a uniform dye uptake effect.

In addition, the front-mounted dye liquor nozzle form of Air and Liquid Multi-flow Dyeing Machine can make the fabric come into contact with the dye liquor quickly in a single cycle (that is, the stroke) at the beginning, and obtain the dye liquor’s quality in time. heat transfer. Compared with the rear-mounted dye liquor nozzle, the former dye liquor and the dyed fabric can obtain a longer heat exchange time in a single cycle, which accelerates the process of completing the heat balance process. This is currently not available in other airflow dyeing machines and ordinary overflow dyeing machines. Precisely because of this equipment condition, the dependence of sensitive colors on the design and control of the dyeing process can be reduced, making the process operation easier.

Temperature balance in the dyeing process

In the process of fabric dip-dyeing, temperature is one of the main process parameters for swelling fibers or extending chemical fiber macromolecular chains and controlling the dye uptake rate. Because the temperature change during the dyeing process of dyeing machine manufacturers is an unstable temperature field, thermal diffusion becomes a characteristic value reflecting the thermal conductivity of the heat transfer system. Obviously, under the same heating or cooling conditions, the greater the thermal conductivity and the smaller the heat storage capacity, the greater the thermal diffusivity, the faster the temperature change rate, and the ability of the temperature at all points in the heat transfer system to tend to the same. The stronger the temperature, the easier it is to reach equilibrium (uniformity).

In practical applications, it is found that Air and Liquid Multi-flow Dyeing Machine is suitable for dyeing sensitive colors. This is closely related to the position between the front-mounted combined dyeing liquid nozzle, the cloth lifting roller and the air nozzle of the Air and Liquid Multi-flow Dyeing Machine, as well as the operating conditions. Air and Liquid Multi-flow Dyeing Machine's front-mounted combined dyeing liquid nozzle is the liquid supply form. The squeezing of the cloth lifting roller facing the fabric and the osmotic pressure of the air flow produce multiple heat diffusion in a single cycle of the fabric. Therefore, it provides favorable conditions for the temperature field required for level dyeing of sensitive colors.

In contrast, the dye liquor of the airflow dyeing machine is entrained in the airflow to form a mixture of water, steam and air. The specific heat difference of each component medium is easy to form a temperature difference in a short time. However, small liquor ratio overflow or jet dyeing machines do not have the conditions for multiple effects of a single cycle of fabrics, and also have the problem of difficult temperature field control for the dyeing of sensitive colors.